Question

2.0 moles of H3PO4 equals how many atoms of O

Answer 1

Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

What is compound and chemical formula

In a compound there are atoms of different elements joined by forces that we call chemical bonds.

The chemical formula indicates the number and type of different atoms present in the molecule.

Avogadro's Number

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Atoms of O

In this case, in 1 mole of the compound H₃PO₄ you have:

• 3 moles of H.
• 1 mol of P.
• 4 moles of O.

Then, in 2 moles of H₃PO₄ you have 8 moles of O.

Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?

$number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}$

number of atoms= 4.8184×10²⁴ atoms

Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

Learn more about Avogadro's Number:

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